package pubshards

import (
	"fmt"
	"io"
	"os"
	"strconv"
	"strings"

	"github.com/spf13/cobra"
	cliapi "gitlink.org.cn/cloudream/jcs-pub/client/sdk/api/v1"
	jcstypes "gitlink.org.cn/cloudream/jcs-pub/common/types"
	"gitlink.org.cn/cloudream/jcs-pub/jcsctl/cmd"
)

func init() {
	var opt exportOption
	c := &cobra.Command{
		Use:   "export <package_path>",
		Short: "export package object metadata as a file",
		Args:  cobra.ExactArgs(1),
		RunE: func(c *cobra.Command, args []string) error {
			ctx := cmd.GetCmdCtx(c)
			return export(c, ctx, opt, args)
		},
	}
	PubShardsCmd.AddCommand(c)
	c.Flags().BoolVarP(&opt.UseID, "id", "i", false, "treat first argumnet as package ID instead of package path")
	c.Flags().StringArrayVarP(&opt.PubShardsNames, "pubshards", "p", nil, "pub shards name")
	c.Flags().StringVarP(&opt.OutputPath, "output", "o", "", "output file path")
}

type exportOption struct {
	UseID          bool
	PubShardsNames []string
	OutputPath     string
}

func export(c *cobra.Command, ctx *cmd.CommandContext, opt exportOption, args []string) error {
	if len(opt.PubShardsNames) == 0 {
		return fmt.Errorf("you must specify at least one userspace name")
	}

	var pkgID jcstypes.PackageID

	if opt.UseID {
		id, err := strconv.ParseInt(args[0], 10, 64)
		if err != nil {
			return fmt.Errorf("invalid package ID: %s", args[0])
		}
		pkgID = jcstypes.PackageID(id)

	} else {
		comps := strings.Split(args[0], "/")
		if len(comps) != 2 {
			return fmt.Errorf("invalid package path: %s", args[0])
		}

		resp, err := ctx.Client.Package().GetByFullName(cliapi.PackageGetByFullName{
			BucketName:  comps[0],
			PackageName: comps[1],
		})
		if err != nil {
			return fmt.Errorf("get package by full name: %w", err)
		}
		pkgID = resp.Package.PackageID
	}

	_, err := ctx.Client.Package().Pin(cliapi.PackagePin{
		PackageID: pkgID,
		Pin:       true,
	})
	if err != nil {
		return fmt.Errorf("pin package: %w", err)
	}

	var pubIDs []jcstypes.PubShardsID
	for _, name := range opt.PubShardsNames {
		resp, err := ctx.Client.PubShards().Get(cliapi.PubShardsGet{
			Name: name,
		})
		if err != nil {
			return fmt.Errorf("get user space %v by name: %w", name, err)
		}

		pubIDs = append(pubIDs, resp.PubShards.PubShardsID)
	}

	resp, err := ctx.Client.PubShards().ExportPackage(cliapi.PubShardsExportPackage{
		PackageID:          pkgID,
		AvailablePubShards: pubIDs,
	})
	if err != nil {
		return fmt.Errorf("export package: %w", err)
	}

	outputPath := opt.OutputPath
	if outputPath == "" {
		outputPath = resp.FileName
	}

	outputFile, err := os.Create(outputPath)
	if err != nil {
		return fmt.Errorf("create output file: %w", err)
	}
	defer outputFile.Close()

	_, err = io.Copy(outputFile, resp.PackFile)
	if err != nil {
		return fmt.Errorf("write output file: %w", err)
	}

	fmt.Printf("Package %v exported to %v, which also set pinned to true\n", pkgID, outputPath)
	return nil
}